Tube Holder Adapter for 1/2" Ends Back Catalog number: 800139 Manufacturer: SENSIDYNE Availability: In the manufacturer's stock Price on request - + Recommended 811-9968-50 Sorbent Tube, Silica Gel, 8X110, 520/360, 50/BX Price on request 800251 Tube Holder Kit, Dual Variable Manifold (Includes Price on request 800170 Tube Holder Hose Barb Fitting Price on request